Global Patent Index - EP 2824473 A1

EP 2824473 A1 20150114 - Compensation for eddy current fields and gradient offsets in MRI

Title (en)

Compensation for eddy current fields and gradient offsets in MRI

Title (de)

Kompensation von Wirbelstromfeldern und Gradientenoffsets in der bildgebenden magnetischen Resonanz

Title (fr)

Compensation pour des champs de courants de Foucault et des décalages de gradient en IRM

Publication

EP 2824473 A1 20150114 (EN)

Application

EP 14176158 A 20140708

Priority

KR 20130079905 A 20130708

Abstract (en)

A magnetic field measuring method in a magnetic resonance imaging (MRI) apparatus includes applying a radio frequency (RF) pulse to an object, acquiring first and second echo signals from a first readout gradient according to test gradients having different intensities, acquiring third and fourth echo signals from a second readout gradient according to the test gradients having different intensities, and determining a characteristic value of an eddy field based on an echo time (TE) of at least one of the first through the fourth echo signals.

IPC 8 full level

G01R 33/565 (2006.01)

CPC (source: EP KR US)

G01R 33/20 (2013.01 - KR); G01R 33/24 (2013.01 - KR); G01R 33/387 (2013.01 - US); G01R 33/56518 (2013.01 - EP US)

Citation (search report)

  • [XI] EP 0818689 A1 19980114 - YOKOGAWA MEDICAL SYST [JP]
  • [XI] EP 0735379 A2 19961002 - YOKOGAWA MEDICAL SYST [JP]
  • [XI] EP 1199578 A2 20020424 - GE MED SYS GLOBAL TECH CO LLC [US]
  • [XA] US 5450010 A 19950912 - MEULEN PETER VAN DER [NL], et al
  • [Y] US 5345178 A 19940906 - MANABE ATSUTAKA [DE], et al
  • [A] JP 2007181587 A 20070719 - HITACHI MEDICAL CORP
  • [A] EP 2158842 A1 20100303 - HITACHI MEDICAL CORP [JP]
  • [Y] TERPSTRA M ET AL: "Localized eddy current compensation using quantitative field mapping", JOURNAL OF MAGNETIC RESONANCE, ACADEMIC PRESS, ORLANDO, FL, US, vol. 131, 1 March 1998 (1998-03-01), pages 139 - 143, XP002359902, ISSN: 1090-7807, DOI: 10.1006/JMRE.1997.1353
  • [Y] SCHMITHORST V J ET AL: "AUTOMATIC GRADIENT PREEMPHASIS ADJUSTMENT: A 15-MINUTE JOURNEY TO IMPROVED DIFFUSION-WEIGHTED ECHO-PLANAR IMAGING", MAGNETIC RESONANCE IN MEDICINE, JOHN WILEY & SONS, INC, US, vol. 47, no. 1, 1 January 2002 (2002-01-01), pages 208 - 212, XP001112346, ISSN: 0740-3194, DOI: 10.1002/MRM.10022

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2824473 A1 20150114; KR 101474757 B1 20141219; US 10042021 B2 20180807; US 2015008921 A1 20150108

DOCDB simple family (application)

EP 14176158 A 20140708; KR 20130079905 A 20130708; US 201414325739 A 20140708